diff --git a/esphome/components/globals/globals_component.h b/esphome/components/globals/globals_component.h
index 78808436af..0283f3259f 100644
--- a/esphome/components/globals/globals_component.h
+++ b/esphome/components/globals/globals_component.h
@@ -39,7 +39,7 @@ template<typename T> class RestoringGlobalsComponent : public Component {
   void setup() override {
     this->rtc_ = global_preferences->make_preference<T>(1944399030U ^ this->name_hash_);
     this->rtc_.load(&this->value_);
-    memcpy(&this->prev_value_, &this->value_, sizeof(T));
+    memcpy(&this->last_checked_value_, &this->value_, sizeof(T));
   }
 
   float get_setup_priority() const override { return setup_priority::HARDWARE; }
@@ -52,15 +52,15 @@ template<typename T> class RestoringGlobalsComponent : public Component {
 
  protected:
   void store_value_() {
-    int diff = memcmp(&this->value_, &this->prev_value_, sizeof(T));
+    int diff = memcmp(&this->value_, &this->last_checked_value_, sizeof(T));
     if (diff != 0) {
       this->rtc_.save(&this->value_);
-      memcpy(&this->prev_value_, &this->value_, sizeof(T));
+      memcpy(&this->last_checked_value_, &this->value_, sizeof(T));
     }
   }
 
   T value_{};
-  T prev_value_{};
+  T last_checked_value_{};
   uint32_t name_hash_{};
   ESPPreferenceObject rtc_;
 };
@@ -85,7 +85,7 @@ template<typename T, uint8_t SZ> class RestoringGlobalStringComponent : public C
     if (hasdata) {
       this->value_.assign(temp + 1, temp[0]);
     }
-    this->prev_value_.assign(this->value_);
+    this->last_checked_value_.assign(this->value_);
   }
 
   float get_setup_priority() const override { return setup_priority::HARDWARE; }
@@ -98,13 +98,12 @@ template<typename T, uint8_t SZ> class RestoringGlobalStringComponent : public C
 
  protected:
   void store_value_() {
-    int diff = this->value_.compare(this->prev_value_);
+    int diff = this->value_.compare(this->last_checked_value_);
     if (diff != 0) {
       // Make it into a length prefixed thing
       unsigned char temp[SZ];
 
       // If string is bigger than the allocation, do not save it.
-      // We don't need to waste ram setting prev_value either.
       int size = this->value_.size();
       // Less than, not less than or equal, SZ includes the length byte.
       if (size < SZ) {
@@ -112,13 +111,17 @@ template<typename T, uint8_t SZ> class RestoringGlobalStringComponent : public C
         // SZ should be pre checked at the schema level, it can't go past the char range.
         temp[0] = ((unsigned char) size);
         this->rtc_.save(&temp);
-        this->prev_value_.assign(this->value_);
       }
+      // Always update last_checked_value_ to match current value, even for oversized strings.
+      // This prevents redundant size checks on every loop iteration when a string remains oversized.
+      // Without this, the diff != 0 check would pass repeatedly for the same oversized string,
+      // wasting CPU cycles on size comparisons.
+      this->last_checked_value_.assign(this->value_);
     }
   }
 
   T value_{};
-  T prev_value_{};
+  T last_checked_value_{};
   uint32_t name_hash_{};
   ESPPreferenceObject rtc_;
 };